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GB1489923A - Frequency measuring arrangement - Google Patents

Frequency measuring arrangement

Info

Publication number
GB1489923A
GB1489923A GB6280/74A GB628074A GB1489923A GB 1489923 A GB1489923 A GB 1489923A GB 6280/74 A GB6280/74 A GB 6280/74A GB 628074 A GB628074 A GB 628074A GB 1489923 A GB1489923 A GB 1489923A
Authority
GB
United Kingdom
Prior art keywords
frequency
input signal
switches
capacitors
sampling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB6280/74A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB6280/74A priority Critical patent/GB1489923A/en
Priority to DE19752504614 priority patent/DE2504614A1/en
Priority to CA219,439A priority patent/CA1028763A/en
Priority to US05/547,598 priority patent/US3977002A/en
Priority to FR7504299A priority patent/FR2260803A1/fr
Publication of GB1489923A publication Critical patent/GB1489923A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/18—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/08—Systems for determining direction or position line
    • G01S1/38—Systems for determining direction or position line using comparison of [1] the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an antenna moving, or appearing to move, in a cyclic path with [2] the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the antenna
    • G01S1/40—Systems for determining direction or position line using comparison of [1] the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an antenna moving, or appearing to move, in a cyclic path with [2] the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the antenna the apparent movement of the antenna being produced by cyclic sequential energisation of fixed antennas

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

1489923 Frequency measuring; Doppler radio navigation; active filters STANDARD TELEPHONES AND CABLES Ltd 4 Feb 1975 [12 Feb 1974] 6280/74 Headings H3A H4D and H3U A frequency measuring arrangement includes means for sampling an input signal waveform, means for deriving from the samples a pattern of sum and difference signals indicative of the relationship between the input signal frequency and the sampling frequency, means responsive to the signals to control a variable frequency generator in such a manner as to cause the input signal and sampling frequencies to be brought into a predetermined relationship with each other, and means for determining the generator frequency as an indication of the input signal frequency. In the embodiment of Fig. 17, each cycle of the input waveform is sampled four times by means of switches which are cyclically controlled # 1 -# 4 by the generator VCO, the switches being connected to capacitors C which are in turn connected to multipliers and an amplifier DI to derive cross products which control VCO. The switches and the capacitors together constitute a tuned filter or the equivalent of a variable delay line controlled by the VCO output. The capacitors are continuously discharged; they may, however, be periodically discharged (Fig. 16, not shown). A taper may be imparted to the input waveform prior to its application to the sampling switches (Figs. 14-15, not shown). The arrangement may be used for frequency tracking in a commutated aerial Doppler navigation system of the kind (LMS) described in Specification 1,234,541. Application to low angle tracking is mentioned. In an active filter, four FET switches driven by a four-phase clock samples the input signal and the sampled outputs over a scan period including a predetermined number of input cycles are summed up in separate capacitors (Fig. 9, not shown) or as in Fig. 17, the third and fourth FET switches are fed with the inverted input signal so that with the combination of outputs as shown only two capacitors are required. A band-pass filter type of response results if in the low-pass filter type of integrator, the capacitor is provided with a current leak. A band-stop filter is obtained by using high pass filters in place of the low-pass filters.
GB6280/74A 1974-02-12 1974-02-12 Frequency measuring arrangement Expired GB1489923A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB6280/74A GB1489923A (en) 1974-02-12 1974-02-12 Frequency measuring arrangement
DE19752504614 DE2504614A1 (en) 1974-02-12 1975-02-04 FREQUENCY MEASURING DEVICE
CA219,439A CA1028763A (en) 1974-02-12 1975-02-05 Frequency measuring arrangement
US05/547,598 US3977002A (en) 1974-02-12 1975-02-06 Tracking filter for frequency measurement in a Doppler type navigation guidance system or the like
FR7504299A FR2260803A1 (en) 1974-02-12 1975-02-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6280/74A GB1489923A (en) 1974-02-12 1974-02-12 Frequency measuring arrangement

Publications (1)

Publication Number Publication Date
GB1489923A true GB1489923A (en) 1977-10-26

Family

ID=9811632

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6280/74A Expired GB1489923A (en) 1974-02-12 1974-02-12 Frequency measuring arrangement

Country Status (5)

Country Link
US (1) US3977002A (en)
CA (1) CA1028763A (en)
DE (1) DE2504614A1 (en)
FR (1) FR2260803A1 (en)
GB (1) GB1489923A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414504A (en) * 1980-11-05 1983-11-08 Motorola Inc. Fractional doppler counting
US4542470A (en) * 1984-07-16 1985-09-17 Spartanics, Ltd. Frequency determining and lock-on system
US4697188A (en) * 1985-02-13 1987-09-29 American Telephone And Telegraph Company, At&T Bell Laboratories Interference canceler with difference beam
WO1986006174A1 (en) * 1985-04-13 1986-10-23 Anritsu Corporation Heterodyne-type method and apparatus for measuring signals, having means for automatically correcting the detuning
US5457637A (en) * 1993-08-20 1995-10-10 Texas Instruments Inc. Flash waveform analyzer method and device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1402885A (en) * 1972-08-03 1975-08-13 Standard Telephones Cables Ltd Doppler radio gui-ance systems
US3866227A (en) * 1973-03-15 1975-02-11 Rca Corp Doppler tracker receiver

Also Published As

Publication number Publication date
DE2504614A1 (en) 1975-08-14
US3977002A (en) 1976-08-24
CA1028763A (en) 1978-03-28
FR2260803A1 (en) 1975-09-05

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee